Update dependency coverage to v7.3.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
coverage	==7.3.0 -> ==7.3.1

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Release Notes

nedbat/coveragepy (coverage)

v7.3.1

Compare Source

• The semantics of stars in file patterns has been clarified in the docs. A
  leading or trailing star matches any number of path components, like a double
  star would. This is different than the behavior of a star in the middle of a
  pattern. This discrepancy was identified by Sviatoslav Sydorenko <starbad_>, who provided patient detailed diagnosis <pull 1650_> and
  graciously agreed to a pragmatic resolution.

• The API docs were missing from the last version. They are now restored <apidocs_>_.

.. _apidocs: https://coverage.readthedocs.io/en/latest/api_coverage.html
.. _starbadhttps://github.com/nedbat/coveragepy/issues/1407#issuecomment-163108520909
.. _pull 165https://github.com/nedbat/coveragepy/pull/1650650

.. _changes_7-3-0:

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